A tailored, contoured fit with just the right amount of gradient pressure.• The greatest pressure is at the ankle at 18 mmHg, gradually reducing throughout the length of the leg to 16 mmHg.• Made of 80% nylon / 20% spandex.• Measuring tapes are included in each box.• Small Regular and Long fit calf circum. 10"-13" (25-33 cm)• Medium Regular and Long fit calf circum.13"-15" (33-38 cm)• Large Regular and Long fit calf circum. 15" -17" (38-43 cm)• X-Large Regular and Long fit calf circum. 17"-19" (43-48 cm)